The Nationals have yet to confirmed Zimmerman’s health status as the team put him on the 15-day disabled list last week. A grade 3 strain usually involves a tear of the hamstring muscle.

"There is still no activity, so we may have something after the game, certainly [Tuesday] when we get here. We'll see what the doctor thinks," Nationals manager Matt Williams said. "He has a pulled hammy and he is not doing anything strength-wise at this point. So it's just kind of a checkup."

Zimmerman is hitting .282 with five home runs and 36 RBI in 53 games this season for the Nationals, who are a half-game ahead of the Atlanta Braves in the National League East. He's missed time earlier this season with a broken thumb and a shoulder injury.